[TowerTalk] Modeling multiband Yagi's

[Joe Subich, W4TV]

On 11/1/2017 1:09 AM, Don W7WLL wrote:
> Have any changes ever been suggested in the ham community that might
> lead to improvement in structure or operation) If either of the
> latter are available, I bet TH7 owners in general would be interested
> in what what the modeling showed or what the suggested changes were.

Roger Cox then/formerly of HyGain posted some dimension changes many
years ago.  I seem to no longer have that posting/e-mail - it was
similar to (but IIRC more extensive than) the "DX" settings (shown on
page 3-7) in the current MFJ/Hy-Gain manual.

73,

    ... Joe, W4TV


On 11/1/2017 1:09 AM, Don W7WLL wrote:
> I asked Dan, AC6LA, offline if he had ever modeled the TH7DX, an antenna 
> I've been using since it was introduced (repaired a few times) and for 
> which I have a spare and a half. He said no but thought someone on 
> Towertalk might have and suggested asking.
> 
> Anyone every modeled this antenna? Have any changes ever been suggested 
> in the ham community that might lead to  improvement in structure or 
> operation) If either of the latter are available, I bet TH7 owners in 
> general would be interested in what what the modeling showed or what the 
> suggested changes were.
> 
> A quick comparison I made from the old original HyGain manual that came 
> with mine many decades ago vs the new manual available at the HyGain/MFJ 
> site didn't reveal any differences, but I could have missed something.
> 
> Was told by a MFJ tech not long ago that the TH7 R 15 M traps (different 
> PN's from those in the DE's) are built to measure out 100 kHz higher (?) 
> than the 15 M DE's. Have  not thought this through yet.
> 
> don W7WLL
> 
> 
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